Method for welding plate tubes and toothed plates of plate type evaporation heat exchanger

A technology of plate evaporation and welding method, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of poor welding quality and shortened service life of equipment, to avoid stress corrosion, reduce welding stress, and ensure tightness. Effect

Active Publication Date: 2015-05-13
LONGHUA TECHNOLOGY GROUP (LUOYANG) CO LTD
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  • Abstract
  • Description
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Problems solved by technology

[0004] In order to solve the problem of poor welding quality existing in the welding of existing heat transfer cores, which leads to a reduction in the service life of equipment, the invention provides a welding method for plate tubes and tooth plates of plate evaporative heat exchangers

Method used

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  • Method for welding plate tubes and toothed plates of plate type evaporation heat exchanger
  • Method for welding plate tubes and toothed plates of plate type evaporation heat exchanger

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Embodiment Construction

[0020] As shown in the figure, the welding method of the plate tube and tooth plate of the plate evaporative heat exchanger, the specific operation steps are as follows:

[0021] 1) Welding of plate tube and plate tube

[0022] 1) Clean up the area to be welded on the plate tube, then assemble the plate tube and the plate tube, and fix the position of the plate tube and the plate tube by tack welding;

[0023] 2) Weld along the weld between the plate tube and the plate tube until the plate tube and the plate tube are welded into a plate bundle with an integrated structure. The distance between them is 5~6mm;

[0024] The welding adopts manual argon arc welding, the welding sequence follows the "one" type welding, the type of power supply is DC, the polarity is positive connection, the diameter of the tungsten pole is φ2.5mm, the diameter of the nozzle is 8-10mm, and the welding method is self-melting. The welding current is 30-40A, the arc voltage is 12-14V, and the weld...

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Abstract

The invention discloses a method for welding plate tubes and toothed plates of a plate type evaporation heat exchanger. Firstly the plate tubes are welded, so that plate bundles are formed, and then the plate bundles and the toothed plates are welded. When the plate tubes are welded, two ends of each welding seam are ended in positions which are 5-6 mm from end parts of the plate tubes; and when the plate bundles and the toothed plates are welded, firstly end faces of the plate bundles and the toothed plates are welded, and then a continuous welding seam which is vertical to the plate tubes is welded on each toothed plate. According to the method for welding the plate tubes and the toothed plates of the plate type evaporation heat exchanger, the welding sequence and the process parameters are limited during welding of the end faces of the plate bundles and the toothed plates, so that welding stress in positions of the plate tubes and tooth tips of the toothed plates is effectively reduced, the stress corrosion of a device during operation is avoided, one welding seam used for covering a contact part of a plate bundle and a toothed plate is welded on each toothed plate at the same time, not only the welding strength of the plate bundles and the toothed plates is enhanced, but also the tightness of a heat transmission core body of the plate type evaporation heat exchanger is guaranteed, and the service life of the device is prolonged.

Description

technical field [0001] The invention relates to the welding of heat exchangers in the field of heat exchange, in particular to a welding method for plate tubes and tooth plates of plate evaporation heat exchangers. Background technique [0002] The evaporative cooling (condenser) is a high-efficiency energy-saving cooling (condensing) device that integrates water cooling and air cooling, heat transfer and mass transfer processes, and has the advantages of both. It has compact structure, high heat transfer efficiency, Low investment, low operating cost, convenient installation and maintenance, etc. Plate type evaporative cooling (condenser) is a kind of evaporative cooling (condenser), which has been widely used in oil refining, metallurgy, electric power, refrigeration, chemical industry and other industries. [0003] The heat transfer core is the heat transfer part (core part) of the plate evaporative cooler (condenser). The heat transfer core is welded by multiple sets o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/16B23K9/095B23K9/235
Inventor 李拴才王庆光韩武涛郎行行卢夙愿李卫董晓强
Owner LONGHUA TECHNOLOGY GROUP (LUOYANG) CO LTD
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